Twice a week we publish the problems that will feature in a forthcoming Dear Jeremy advice column in the Saturday Guardian so that readers can offer their own advice and suggestions. We then print the best of your comments alongside Jeremy's own insights. Here is the latest dilemma – what are your thoughts?

I work for the NHS and job share with a person suffering from degenerative MS. I have been in the job for almost two years and during that time we have taken on more and more work, and our line manager is now out of the office for three out of four days.

My colleague refuses to admit she has a problem, but she is clearly unable to carry out even simple tasks, is extremely slow and spends most of her day making or receiving personal calls and browsing the internet, while I run around trying to keep everything going.

In my line manager's absence I have to supervise my colleague, manage reception and deal with everyone coming to me to get things done because they know my colleague cannot, or will not, help.

We are both the same grade and I have complained many times to my line manager. She agrees with everything I say but claims her hands are tied, as she has discussed the situation with the manager above her and no support is forthcoming.

I have told my line manager that I am going under with stress, but still no action has been taken. I really need to know if I have any rights in this matter or if all rights lie with my colleague, and the best way to proceed. This is affecting my mental health.

Do you need advice on a work issue? For Jeremy's and readers' help, send a brief email to dear.jeremy@theguardian.com. Please note that he is unable to answer questions of a legal nature or reply personally.